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Petrified lightning, known as fulgurite, is formed when lightning with a temperature of at least 1,800 °C (3,270 °F) melts silica or other common conductive and semi-conductive minerals and substrates, fusing, vitrifying, oxidizing and reducing mineral grains and organic compounds. According to Wikipedia “Fulgurites (from the Latin fulgur, meaning “lightning”) are classified generically as a variety of... / READ MORE /